Microstructures related to the ferroelectric properties in BiFeO3-BaTiO3

抄録

Microstructures related to the ferroelectric (FE) properties in (1-x)BiFeO3-xBaTiO3 were examined mainly by a transmission electron microscopy, in combination with conventional magnetic and dielectric measurements. It was found that macroscopic-sized FE domain structures in BiFeO3 changed into fine FE microstructures with the 20-30nm size in the x=0.25 compound, as the BaTiO3 concentration (x) was increased. In addition, we found characteristic tweed-like contrast due to the strain field in the x=0.33 compound at room temperature. We carefully investigated a spatial distribution of the FE microdomains in the x=0.25 compound by obtaining real-space images and determined the spatial configuration of the spontaneous polarization in each FE microdomains.